https://en.wikipedia.org/wiki/Optic_chiasm#/media/File:Brain_MRI_150443_rgbca_t1_t2_t2STIR_misreg.png

oh and they were going to dress up as 'aliens' too...go figure:

 

"ed was in charge of costumes"

 

https://en.wikipedia.org/wiki/Optic_chiasm