students of the occult will be aware that it can be performed with a simple incantation , three small bits of wood and 4cc of mouse blood , but no wizard worth his pointy hat would dream of doing anything so unimpressive ; they knew in their hearts that if a spell did n't involve big yellow candles , lots of rare incense , circles drawn on the floor with eight different colours of chalk and a few cauldrons around the place then it simply was n't worth contemplating .