Btukfyl

I wish to remove parts of the letter outside the contour that forms the shape of the brain below.

documentclass[10pt]{standalone}

usepackage{pgf,tikz}

usepackage{libertine}



begin{document}



 begin{tikzpicture}



 draw(11.61697,6.215) node {scalebox{13.6}{color{purple!77}math} scalebox{6.915}{color{gray}&} };

 draw(11.7,3) node {scalebox{14.7}{color{gray} physics}};

 draw(10.7,.32) node {scalebox{8.59}{color{cyan!96}MATTER}};





 draw[ line width=1.2mm] plot [smooth,tension=.6] coordinates { (11.611676609979014,-1.1158187173456824)  

    (12.557159646551849,-0.845680706896301)  

    (13.603944437043202,-0.6768444503654376)  

    (14.397474842738259,-0.42359006556914264)  

    (15.258539751045662,-0.1703356807728476)  

    (16.27155729023084,-0.10280117816050227) 

    (17.16638944984442,-0.20410293207902028) 

    (18.07810523511108,-0.13656842946667494)  

    (18.922286517765396,0.25175496055431074)  

    (19.445678913011072,1.2141216227802318)  

    (19.51321341562342,2.277790038924671)  

    (18.82098476384688,3.5778292142123185)  

    (18.230057865988858,4.371359619907376)  

    (17.740432722049352,4.793450261234534)  

    (17.520945588559233,5.418144410398729) 

    (16.778066059823434,5.840235051725887)  

    (16.305324541537015,6.38051107262465)  

    (15.579328638454303,6.6675327087271175)  

    (14.566311099269123,7.089623350054276)  

    (13.51952630877777,7.342877734850571) 

    (12.50650876959259,7.477946740075262)  

    (11.594792984325927,7.477946740075262)  

    (10.649309947753093,7.410412237462917)  

    (9.602525157261741,7.224692355278967)  

    (8.623274869382733,7.055856098748103)  

    (7.863511714993848,6.785718088298722)  

    (6.884261427114841,6.5493473291555135) 

    (5.9050111392358335,5.87400230303206)  

    (5.195898861806207,5.36749353343947)  

    (4.554321086988926,4.371359619907376)  

    (4.250415825233373,3.999919855539477)  

    (3.9465105634778186,3.6622473424777504)  

    (3.7945579326000414,3.0206695676604696)  

    (3.8452088095593004,2.3284409158839297)  

    (3.980277814783991,1.7712812693320807) 

    (4.047812317396336,1.3998415049641815) 

    (4.2166485739272,1.0115181149431958)  

    (4.3686012048049765,0.7413801044938144)  

    (4.571204712642013,0.23487133490122442) 

    (4.959528102662999,-0.1703356807728476)  

    (5.398502369643244,-0.47424094252840165)  

    (6.006312893154352,-0.5755426964469197) 

    (6.61412341666546,-0.5248918194876606)  

    (7.25570119148274,-0.47424094252840165)  

    (7.812860838034589,-0.6937280760185239)  

    (8.150533351096316,-1.1327023429987686)  

    (8.707692997648165,-1.5716766099790134)  

    (9.315503521159274,-1.8924654973876538)  

    (10.,-2.) 

    (10.919447958202474,-1.605443861285186) (11.611676609979014,-1.1158187173456824) };



 end{tikzpicture}



end{document}