If you want to get really kooky, read up on Western Esotericism and Chaos Magic or tantric Buddhist practices and etc. They make basically this exact claim that this is how you "do magic" or similar such things, via sustained, "one-pointedness" and focus of attention and the Will ("gnosis"), and that, yes, often this one-pointedness of mind/attention is what lets you manifest things.
Untrue, of course, but very clearly something people have believed almost universally for centuries.
Untrue, of course, but very clearly something people have believed almost universally for centuries.